When his oddball father suddenly decides to remarry, high school student Toujo Basara is about to acquire some very peculiar new family members. Enter his new seductive step-sisters, Mio and Maria. When Basara discovers that one of his step-sisters is a succubus and his other a recently crowned demon lord, all hell breaks loose! Basara is almost forced into a contract with his demonic sisters where he would act as their eternal servant—but something goes wrong. Instead, a reverse contract is formed, and Basara becomes the master. Between fending off their seductive advances to coping with the attacks of rival demon contractors, Basara has a big learning curve if he is to survive. (Source: Seven Seas Entertainment)

High school student Toujo Basara’s life has taken a turn for the strange. Although hesitant about his father’s sudden decision to remarry, he can’t deny it comes with a couple perks—drop-dead gorgeous step-sisters…who also happen to be members of a demon clan! Mio Naruse is a Demon Lord and Maria Naruse her succubus servant. Chaos and passionate antics ensue as Basara gets acquainted with his new demonic siblings, trying to protect them from dangerous demon rivals and struggling to keep up with their lusty, devilish appetites. (Source: Seven Seas Entertainment)

In a universe where teenagers are often sucked into other worlds regularly, there is an international organization called BABEL, which trains and teaches returnees to control the magic they have brought back from different worlds. Two of their young students, returning from the world Alayzard, are brother and sister Akatsuki and Miu Ousawa. There are only some little problems here - they aren't actually related; Miu is the daughter of Alayzard’s Demon King, and Akatsuki doesn't have magic! (Source: Manga Planet)

The story follows an international training organization named Babel which protects the young people returning from another world. A wayward hero named Akatsuki has come back to the real world from a world of sword and magic called Alleyzard, along with beautiful girl, Miu, who is a demon king's daughter. In the academy of Babel, Akatsuki confronts other "returners", who have psychic powers.

Will you share your room, your bed and all the things that make you feel good? Ayanagi Yukihira, a second year high school student, decided to live alone after her parents divorced. When she opened the door to her new house - her classmate Yuu Fukami was here, just after her bath!　What is this romantic comedy development? It was a double contract due to a mistake, but the girls feel safe with each other and we accept to live together. At first they were just roommates with similar circumstances, but ...... Under one roof, their feelings for each other grow with each physical contact. They kiss, hug and even do things they can't tell anyone ! (Source : Kakodawa, translated)